function GetQueryString(name)
{
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
    var r = window.location.search.substr(1).match(reg);
    if(r!=null)return  unescape(r[2]); return null;
}

function appId() {
    var appId = window.sessionStorage.getItem("appId");
    if (appId == null || appId == undefined)
        return null;
    else
        return appId;
};